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Subject: [OASIS Issue Tracker] Commented: (ODATA-374) Returning heterogeneous types for a function call

    [ http://tools.oasis-open.org/issues/browse/ODATA-374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=33518#action_33518 ] 

Ralf Handl commented on ODATA-374:

If these four entity types have a common base type, then you can use that base type instead of Edm.EntityType.

Another possibility would be to invent a term in a special vocabulary, e.g. com.ca.vocabs.SomeVoc:

<Term Name="PossibleEntityTypes" Type="Collection(Edm.String) AppliesTo="EntitySet"/>

and annotate your function return type:

  <ReturnType Type="Collection(Edm.EntityType)>
    <Annotation Term="com.ca.vocabs.SomeVoc.PossibleEntityTypes">

> Returning heterogeneous types for a function call
> -------------------------------------------------
>                 Key: ODATA-374
>                 URL: http://tools.oasis-open.org/issues/browse/ODATA-374
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: New Feature
>          Components: OData CSDL, OData Protocol 
>    Affects Versions: V4.0_WD01
>         Environment: [Proposed]
>            Reporter: Anila Kumar GVN
>            Assignee: Anila Kumar GVN
>             Fix For: V4.0_WD01
> It is not clear if OData enables a service to return a collection of heterogenous entity/complex types as a response to a function call. 
> I want to return a collection of types in response to a function call but each of the items in the collection could belong to different entity types.
> Example:
> /OData.svc/GetCreatedEntities?before=xxxx-xx-xx&after=xxxx-xx-xx
> here GetCreatedEntities is a function call on my product that return a collection of entities that are Created in a given time period. Return Type is a Collection Type that could contain a Customer type, Order type etc.
> Is it supported in OData? 

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